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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400,000,000
Less: Unamortized Debt Issuance Costs	$ 18,526,000	26,852,000
Total Debt	2,435,406,000	2,424,001,000
Less: Current Portion	231,675,000	22,574,000
Long-Term Debt	$ 2,203,731,000	$ 2,401,427,000
Senior Notes Due March 2027
Debt Instrument [Line Items]
Stated rate, debt instrument	7.25%	7.25%
Debt instrument, face amount	$ 700,000,000	$ 700,000,000
Debt instrument, unamortized premium	5,878,000	6,686,000
Total Debt	$ 705,878,000	$ 706,686,000
Senior Notes Due March 2027 | Debt Instrument, Issuance, Period One
Debt Instrument [Line Items]
Stated rate, debt instrument			7.25%
Senior Notes Due March 2027 | Debt Instrument, Issuance, Period Two | Private Offering
Debt Instrument [Line Items]
Debt instrument, face amount			$ 200,000,000
Unamortized bond premium			$ 7,000,000
Senior Notes Due January 2029
Debt Instrument [Line Items]
Stated rate, debt instrument	6.00%	6.00%
Total Debt	$ 500,000,000	$ 500,000,000
Senior Notes Due April 2030
Debt Instrument [Line Items]
Stated rate, debt instrument	4.75%
Debt instrument, face amount	$ 400,000,000
Debt instrument, unamortized premium	4,952,000
Total Debt	$ 395,048,000	$ 0
Senior Notes Due March 2026
Debt Instrument [Line Items]
Stated rate, debt instrument	6.50%	6.50%
Debt instrument, face amount	$ 234,169,000
Debt instrument, unamortized discount	1,976,000	$ 3,875,000
Total Debt	$ 232,193,000	$ 396,125,000
Convertible Senior Notes Due May 2026
Debt Instrument [Line Items]
Stated rate, debt instrument	2.25%	2.25%
Debt instrument, face amount	$ 345,000,000	$ 345,000,000
Debt instrument, unamortized discount	95,537,000	107,735,000
Total Debt	249,463,000	237,265,000
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount					$ 160,000,000
Revolving Credit Facility | CNX Midstream Partners LP Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt	146,000,000	291,000,000
Revolving Credit Facility | CNX Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt	225,350,000	160,800,000
Line of Credit
Debt Instrument [Line Items]
Debt instrument, face amount				$ 175,000,000
Line of Credit | Cardinal States Gathering Company Credit Facility maturing in March 2028
Debt Instrument [Line Items]
Debt instrument, face amount		114,985,000
Debt instrument, unamortized discount		1,126,000
Total Debt	0	113,859,000
Line of Credit | CSG Holdings II LLC Credit Facility maturing in March 2027
Debt Instrument [Line Items]
Debt instrument, face amount		45,559,000
Debt instrument, unamortized discount		441,000
Total Debt	$ 0	$ 45,118,000

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